The man, who was not named by police, sustained serious injuries as a result of the collision which occurred at 6.07am on Saturday and involved a lorry and several vehicles between Junction 29 and Junction 30 of the motorway.

He was taken to the University of Wales Hospital in Cardiff where he subsequently died. Another male was also injured as a result of the collision and he is in a stable condition.

Gwent Police are appealing for anyone who might have witnessed the collision to contact them on 101.